Sand-molding apparatus



(No Model.) 2 SheetsSheet 1. F. GANDY.

SAND MOLDING APPARATUS.

No. 433,166. Patented July 29,1890.

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(No Model.) 2 Sheets-Sheet 2.

1:". GANDY.

SAND MOLDING APPARATUS Patented July 29, 1890.

\\R\ R u a: i1; 1 TIT j; w m a N .ZZ'ZVlgH/UF 4% @220 FREDERICK GANDY, OF FERNBANK, OHIO.

SAN D-MOLDING APPARATUS.

SPECIFICATION forming part of Letters Patent No. 433,166, dated July 29, 1890.

Application filed October 8, 1889- Serial No. 32 6,321. (No modeLl State of Ohio, have invented a certain new and useful Improvement in Sand Elevators and Screeners, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of the specification.

' Myinvention relates to elevators and screeners for automatically elevating, mixing, and screening the sand-such as is used in foundries-and for delivering the sand from the sand-pit or from the heap where it is deposited to the molds by mechanical means. In the foundry the sand which has been used to form the molds for castings after use becomes dry and hard,and it is customaryto dumpthis sand into a sand-pit orinto heaps where the lumps are broken up and fresh loam and clay washes are mixed with it to render the sand suitable for reuse. The sand is then shoveled out of the pit into heaps and from there transferred to the molds. All these operations have hitherto been performed by hand, and my inven tion has for its object to dispense with a large part of this manual labor and to pulverize, mix, and screen this sand much more thoroughly than is now done, and at the same time that these operations are going on to transport it from the pit to the point of use without further handling.

My invention consists of an elevator for raising the sand,hopper and rollers for grinding and pulverizing, vibrating screen for sifting, bin for storing, and sand-chute for con ducting the sand back to the place Where it is to be used.

Referring to the accompanying drawings, Figure 1 is a side elevation of my improved elevator and screener. Fig. 2 is atop plan view of the same.

Like letters of reference indicate identical parts in both the figures.

A is the sand-pit, usually in the floor of the foundry, with one end B much deeper than the rest, down into which deeper portion of the pit the elevator C extends. This elevator 0 consists of an endless belt a, running over pulleys or drums D and E at the top and bottom of the elevator. Upon this bolt the elevator buckets or scoops h in endless series are attached. The drum D is operated by shaft and pulley F, which receives its motion from the main driving-shaft in the usual way. I prefer to use scoops hay'ing bottom, back, and sides, but no front or' top, of the shape shown in the drawings; but any other kind of elevator-bucket can be used. The elevator is also incased from top to bottom, so that any sand falling from the scoops or buckets will slide down the elevator to the pit, to be again scooped up. Directly under the top of the elevator the sand-hopper-G is placed, one side being partially cut away to allow the entrance of the elevator-buckets. These buckets or scoops, when they have reached the highest point turning on the endless belt, discharge their contents into the hopper and return again to the pit fora new supply. In the bottom of this sand-hopper G there are two rollers H and I. One of these rollers II is mounted on a shaft (1, j ournaled in the sides of the hopper in suitable bearings. To this shaft a pulley e is attached, and motion is thus communicated to the roller II by belt g from a pulley K on the shaft operating the elevator-drum. The other roller I rests loosely in the bottom of the hop per in contact with the roller I'l, turning in an opposite direction as the roller II is revolved, this roller I being sufficiently heavy to keep its place when the sand alone is being pulverized; but should any pieces of iron or other refuse be mixed with the same as it is delivered to the hoppers the roller I will rise up and allow the refuse matter to pass through without damage to the rollers, or this loose roller may be held in contact with the roller II by means of a yielding spring, as shown, instead of merely by gravity. The sand having passed through the rollers, drops down upon the sand-screen K. This screen K ispivoted at its forward end to suitable supports L and is inclined at an angle, so that the sand will slide down over the wire meshes M. The other end of this screen rests upon a shaft N, which is provided with cam-wheels O. This shaft N is revolved by the pulley Z, which receives its motion by belt h from the pulley f on the shaft (Z. In this way the screen K is vibrated, and the fine sand passes through the wire meshes of the screen upon the inclined sand-chute I and thence to the sandbin R, while the refuse matter passes directly into the refuse-hopper S, and thence is drawn offinto cars T and removed. 7

When sand is desired for the molds, it is drawn from the sand-bin through the sandchute U. This chute is' supported by the rod m and is pivoted at the sand-bin, as shown,

so that it can be swung from side to side and the sand deposited Wherever desired.

All the various parts of my apparatus are supported in place by various beams and supports, which need not be here described.

\Vhen sand is being used continuously at the molds, the sand can be conducted from'the chute P to the chute U by placing a board extending from the discharge of one chute to the opening of the other, so as practically to make one continuous inclined passage-way from chute P to the molds.

FREDERICK GANDY.

Witnesses:

W. J. BYRNE, ALFRED M. ALLEN. 

